/Engine/Source/Runtime/Engine/Public/MaterialCompiler.h
virtual int32 StrataEyeBSDF ( int32 DiffuseAlbedo, int32 Roughness, int32 IrisMask, int32 IrisDistance, int32 IrisNormal, int32 IrisPlaneNormal, int32 SSSProfileId, int32 EmissiveColor, int32 CorneaNormal, const [FString](API\Runtime\Core\Containers\FString) & SharedLocalBasisIndexMacro, [FStrataOperator](API\Runtime\Engine\Rendering\FStrataOperator) * PromoteToOperator )